* {
  margin: 0;
  padding: 0;
}

a {
  text-decoration: none;
  color: gray;
}

li {
  list-style: none;
}

.l {
  float: left;
}

.r {
  float: right;
}

.clearfix:after {
  content: '';
  display: block;
  clear: both;
}